package tgc.edu.exam.custom;

import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

import com.google.zxing.LuminanceSource;

public class BufferedImageLuminanceSource extends LuminanceSource {

	
	    private final BufferedImage image;
	    private final int left;
	    private final int top;

	    public BufferedImageLuminanceSource(BufferedImage image) {
	        this(image, 0, 0, image.getWidth(), image.getHeight());
	    }

	    public BufferedImageLuminanceSource(BufferedImage image, int left,
	            int top, int width, int height) {
	        super(width, height);

	        int sourceWidth = image.getWidth();
	        int sourceHeight = image.getHeight();
	        if (left + width > sourceWidth || top + height > sourceHeight) {
	            throw new IllegalArgumentException(
	                    "Crop rectangle does not fit within image data.");
	        }

	        for (int y = top; y < top + height; y++) {
	            for (int x = left; x < left + width; x++) {
	                if ((image.getRGB(x, y) & 0xFF000000) == 0) {
	                    image.setRGB(x, y, 0xFFFFFFFF); // = white
	                }
	            }
	        }

	        this.image = new BufferedImage(sourceWidth, sourceHeight,
	                BufferedImage.TYPE_BYTE_GRAY);
	        this.image.getGraphics().drawImage(image, 0, 0, null);
	        this.left = left;
	        this.top = top;
	    }

	    
	    public byte[] getRow(int y, byte[] row) {
	        if (y < 0 || y >= getHeight()) {
	            throw new IllegalArgumentException(
	                    "Requested row is outside the image: " + y);
	        }
	        int width = getWidth();
	        if (row == null || row.length < width) {
	            row = new byte[width];
	        }
	        image.getRaster().getDataElements(left, top + y, width, 1, row);
	        return row;
	    }

	    
	    public byte[] getMatrix() {
	        int width = getWidth();
	        int height = getHeight();
	        int area = width * height;
	        byte[] matrix = new byte[area];
	        image.getRaster().getDataElements(left, top, width, height, matrix);
	        return matrix;
	    }

	    
	    public boolean isCropSupported() {
	        return true;
	    }

	    
	    public LuminanceSource crop(int left, int top, int width, int height) {
	        return new BufferedImageLuminanceSource(image, this.left + left,
	                this.top + top, width, height);
	    }

	    
	    public boolean isRotateSupported() {
	        return true;
	    }

	    
	    public LuminanceSource rotateCounterClockwise() {
	        int sourceWidth = image.getWidth();
	        int sourceHeight = image.getHeight();
	        AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0,
	                0.0, 0.0, sourceWidth);
	        BufferedImage rotatedImage = new BufferedImage(sourceHeight,
	                sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
	        Graphics2D g = rotatedImage.createGraphics();
	        g.drawImage(image, transform, null);
	        g.dispose();
	        int width = getWidth();
	        return new BufferedImageLuminanceSource(rotatedImage, top,
	                sourceWidth - (left + width), getHeight(), width);
	    }
	}

